laptop(s) keyboards, some keys are not functioning

many of the laptop I've encountered has keys problem
but I'm not sure if the problem is in the BIOS or in the keyboard itself
example:
left arrow, right control, right alt, func key doesn't

which do you think the problem from?
thank you
LVL 14
systanAsked:
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SuperTacoCommented:
Moe then likely the keyboards.  
JohnnyCanuckCommented:
Sounds like the keyboard.  Since all of the keys (except FN) are beside each other, it seems like a spill.
systanAuthor Commented:
Ok, to be sure, what if these keys aren't working?
- , y , t , tab , g , v , left arrow , right arrow
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systanAuthor Commented:
Ok, to be sure, what if these keys aren't working?
- , y , t , tab , g , v , left arrow , right arrow


it seems like a spill.
what do you meant by spill?
thanks
sjklein42Commented:
Try removing the keyboard and reinstalling it.  Maybe the ribbon cable needs reseating.  Otherwise, I agree with the others that it may be time for a new keyboard.

You can almost always find instructions by googling "laptop keyboard removal" along with the model number.

First, you can confirm it is the laptop keyboard by plugging in a USB keyboard and seeing if that works ok.

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systanAuthor Commented:
First, you can confirm it is the laptop keyboard by plugging in a USB keyboard and seeing if that works ok.

So if the external USB keyboard is find to used, then it is confirm that the problem is the keyboard set only??

I think this can be fixed by washing the keyboard set by an alcohol, droned it for a minutes.  I hope the circuits are OK when liquid dries.  I hope that works.

thanks
systanAuthor Commented:
So if the external USB keyboard is find to used, then it is confirm that the problem is the keyboard set only??
my bad
So if the external USB keyboard is fine to used, then it is confirm that the problem is the keyboard set only??
systanAuthor Commented:
my bad again
So if the external USB keyboard is fine to used, then it is confirmed that the problem is the keyboard set only??
sjklein42Commented:
Ha.  Maybe it is your fingers, not the keyboard!  (Just joking.)

Yes, that is what I meant.  If the USB keyboard works, then it is almost surely the laptop keyboard that is broken.  You may be able to clean it - nothing to lose - but I have never been able to bring them back.  Try reseating the ribbon cable first.
systanAuthor Commented:
but I have never been able to bring them back
experienced

even what I have mentioned?
I think this can be fixed by washing the keyboard set by an alcohol, droned it for a minutes.  I hope the circuits are OK when liquid dries.  I hope that works.

Ok, that's a fine answer maybe, gotho close this post for a while this day,
thanks
☠ MASQ ☠Commented:
Although the block of keys affected would support the liquid spill theory, do remember that some manufacturers allow the function key to be locked/unlocked to prevent unintentional use.

An example from HP here
nobusCommented:
you can always test if the keyboard keys work or not when booted from a live cd :
http://www.ubcd4win.com/                              ubcd  Win
ftp://ftp.gwdg.de/pub/linux/knoppix/KNOPPIX_V6.7.0CD-2011-08-01-EN.iso          Knoppix

that will show if the hardware is bad or not


>>  So if the external USB keyboard is fine to used, then it is confirm that the problem is the keyboard set only??   <<  NOT TRUE - it can still be the motherboard keyboard controller or connector circuitry

and washing does not help in most cases; the keyboards are made with layered sheets - but as said, nothing to loose by trying
systanAuthor Commented:
NOT TRUE - it can still be the motherboard keyboard controller or connector circuitry
I think this cause by a bios update/downdate/update

Ok, I think the answers are complete, let me have time to close this post, for a while this day.

thanks to all
nobusCommented:
>>  I think this cause by a bios update/downdate/update   <<  ? ? not sure what you mean, but if you suppose a bios update influences the working of the keyboard - you're wrong afaik
 
systanAuthor Commented:
thank you all
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